A sliding device for steel box girder construction

Abstract

The application discloses a sliding device for steel box girder construction, which comprises a supporting assembly, a driving mechanism, and a receiving table for placing and fixing a prefabricated reinforcement cage, wherein the receiving table is slidingly installed on one end of the driving mechanism extending outside the supporting assembly; under the driving action of the driving mechanism, the receiving table slides along a direction perpendicular to the trend of the supporting assembly and along a direction parallel to the trend of the supporting assembly; the device mainly moves the prefabricated reinforcement cage to a designated installation position through the mechanism of an auxiliary crane; the reinforcement cage installed on the device can always be outside the five-meter range of high-voltage lines regardless of how it moves, is safe, is not affected by external construction environment, and the clamping pieces limit the side wall and the bottom of the reinforcement cage under the driving of the gravity of the reinforcement cage, so that the reinforcement cage structure placed on the receiving table is more stable and difficult to slide.

Description

Technical Field

[0001] This application relates to the field of steel box girder installation technology, and in particular to a sliding device for steel box girder construction. Background Technology

[0002] The existing construction process requires the construction of a bridge over the river. During the bridge construction, a crane is used to lift the pre-tied and welded steel cage between two pre-set columns of the bridge to be erected. After the steel cage is installed, the entire concrete is poured on site.

[0003] The current construction environment involves high-voltage power lines not far from the bridge construction site. Since these power lines carry voltages exceeding 3000V, any distance within five meters of them poses a danger. The bridge itself is located beyond five meters of these power lines. Given this environment, when using a crane to lift the rebar cage, the crane boom moves both horizontally and vertically. During the vertical movement, the crane boom will inevitably reach a height higher than the designated position of the rebar cage. While this ensures the cage remains within a safe construction range, the crane boom is still within five meters of the high-voltage power lines. This poses a risk of electric shock during crane lifting, compromising on-site safety.

[0004] Regarding the aforementioned technologies, the inventors believe that directly using a crane to lift steel box girders, even with excellent insulation protection measures, can still easily lead to danger.

[0005] In summary, the existing equipment for steel box girder construction still has problems. During the hoisting process of the reinforcing cage, the hoisting boom is too high, and it cannot be guaranteed that the hoisting can be carried out at least five meters away from the high-voltage power lines, which can easily lead to danger during the hoisting process. Summary of the Invention

[0006] The purpose of this invention is to provide a sliding device for steel box girder construction, in order to solve the technical problem that in the prior art, the device for steel box girder construction is hoisted at a high height and with a wide coverage area during the hoisting process of the steel cage, and it is not possible to guarantee that the hoisting is carried out at a distance of more than five meters from the high-voltage power lines, which can easily lead to danger during the hoisting process.

[0007] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: A sliding device for steel box girder construction includes a support assembly installed on one side of the bridge to be erected and parallel to the bridge to be erected. The drive mechanism, which is located in the support assembly, has the function of synchronously adjusting the movement in the horizontal and vertical coordinate directions; A receiving platform is used for placing and fixing precast steel cages. The receiving platform is slidably installed on one end of the drive mechanism that extends outward from the support assembly. The drive mechanism drives the receiving platform to slide simultaneously along a direction perpendicular to the direction of the support component and along a direction parallel to the direction of the support component, so that the steel cage on the receiving platform always slides within a safe construction horizontal area close to the surface of the bridge to be installed, until it slides to the designated installation position.

[0008] In a preferred embodiment of the present invention, the support assembly includes two support plates and support columns disposed on both sides of the bottom of the support plates. The support plates and support columns are arranged perpendicularly to each other. The two support plates are arranged parallel to the bridge to be erected. The surfaces of the two support plates are connected to the driving mechanism.

[0009] As a preferred embodiment of the present invention, the driving mechanism includes a first power component, a second power component, and a mounting plate that slides across the two support plates. The first power component and the second power component are connected by a linkage component. The first power component is disposed between the two support plates and is connected to the mounting plate. Under the drive of the first power component, the mounting plate moves along the two support plates to adjust the position of the receiving platform. The second power component is installed in the inner cavity of the mounting plate. During the process of the first power component driving the mounting plate to move, the second power component synchronously drives the receiving platform to move along the length direction of the mounting plate.

[0010] As a preferred embodiment of the present invention, the first power assembly includes a connecting plate fixedly connected between two support columns, a servo motor fixedly connected to the connecting plate, a second lead screw rotatably connected to the connecting plate, and a rack disposed on the upper surface of the support plate along its length. The second lead screw is coaxially and fixedly connected to the rotating shaft of the servo motor, and the second lead screw is arranged parallel to the support plate. The bottom connecting block of the mounting plate is screwed onto the second lead screw, and the mounting plate slides along the second lead screw under the drive of the servo motor. The rack and the second power assembly extend outward from the mounting plate and engage with each other. As the mounting plate moves along the rack, the second power assembly rotates synchronously with the movement of the mounting plate, so that the receiving platform moves along the length of the mounting plate.

[0011] In a preferred embodiment of the present invention, the second power assembly includes a first lead screw rotatably connected to the inner cavity of the mounting plate along its length, and a gear coaxially fixed to the first lead screw. A groove is formed on the upper surface of the mounting plate, and the first lead screw is rotatably connected to the inner cavity of the groove. The first lead screw is threadedly connected to the receiving platform. The gear is coaxially fixed to the outer wall of the end of the first lead screw that extends out of the mounting plate. The gear meshes with a rack, and the gear rotates along the rack to drive the first lead screw to rotate synchronously, thereby moving the receiving platform along the mounting plate.

[0012] As a preferred embodiment of the present invention, the upper surfaces of the two support plates are provided with guide rails along their own length direction, and the guide rails are located inside the rack. The bottom of the mounting plate is provided with a sliding groove that cooperates with the guide rail, and the arrangement direction of the sliding groove is parallel to the arrangement direction of the second lead screw.

[0013] As a preferred embodiment of the present invention, a limiting member is provided between the receiving platform and the mounting plate for the receiving platform to slide along the length direction of the mounting plate. The limiting member includes a limiting strip fixed on the upper surface of the mounting plate along the length direction and a limiting block fixed on the bottom surface of the receiving platform. The limiting strip is located on both sides of the groove, and the limiting block slides on the limiting strip.

[0014] As a preferred embodiment of the present invention, an installation groove is provided at the center of the upper surface of the receiving platform, and several air guide pipes are provided on the receiving platform along the length of the two side walls of the installation groove. A first air outlet is provided on the side wall opposite to the air guide pipes on both sides of the installation groove, and a first flexible plate is fixed on the inner wall of the first air outlet. The inner cavity of the mounting groove is equipped with an inflation assembly for inflating the air duct. Under the inflation action of the inflation assembly, the first flexible plate bulges outward to clamp and fix the side wall of the steel cage.

[0015] As a preferred embodiment of the present invention, the inflatable assembly includes a pressure plate and an airbag connected to the bottom of the pressure plate. The pressure plate is slidably connected in the mounting groove, and the airbag is located between the pressure plate and the receiving platform. The airbag is connected to the inner cavity of the air guide tube through an air tube. A telescopic spring is connected between the side of the pressure plate facing the mounting groove on both sides of the airbag and the bottom of the mounting groove.

[0016] As a preferred embodiment of the present invention, the inner cavity of the pressure plate is hollow, and a plurality of second air vents are evenly spaced on the upper surface of the pressure plate. A second flexible plate is fixed inside the inner cavity of the second air vents. The airbag is connected to the inner cavity of the pressure plate through an air pipe. Under the pressure of the reinforcing cage, the airbag is compressed to deform the second flexible plate, thereby reducing the possibility of the reinforcing cage sliding on the receiving platform.

[0017] To address the aforementioned technical problems, the present invention further provides the following technical solution: Compared with the prior art, the present invention has the following advantages: The device mainly uses an auxiliary crane to move the prefabricated steel cage to the designated installation position. No matter how the steel cage is moved, it will always be within five meters of the high-voltage line, ensuring high safety and being unaffected by the external construction environment. Furthermore, the device can accurately move the steel cage to the designated position to complete the connection with the bridge.

[0018] Meanwhile, the device limits the steel cage by using clamping components on the airbag. During the limiting process, the power source for driving the clamping components is mainly the weight of the steel cage itself. Driven by the weight of the steel cage itself, the clamping components limit the side walls and bottom of the steel cage, making the steel cage structure more stable on the receiving platform and less prone to slippage. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc., illustrated in this specification are merely for illustrative purposes to aid those skilled in the art and to facilitate their understanding. They are not intended to limit the implementation of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effectiveness and objectives of this invention, should still fall within the scope of the technical content disclosed herein. Figure 1 This is a schematic diagram of the overall structure of this embodiment; Figure 2 This is a schematic diagram of the overall structure of the first power component and the second power component in this embodiment; Figure 3 This is a schematic diagram of the overall structure of the limiting component in this embodiment; Figure 4 yes Figure 1 A magnified view of a section at point A in the middle; Figure 5 This is a schematic diagram of the connection structure between the receiving platform and the inflatable assembly in this embodiment; The labels in the diagram represent the following: 1. Support column; 2. Support plate; 3. Receiving platform; 4. Drive mechanism; 5. Mounting plate; 6. Guide rail; 7. First power assembly; 8. Second power assembly; 9. First lead screw; 10. Gear; 11. Rack; 12. Limiting component; 13. Groove; 14. Limiting strip; 15. Limiting block; 16. Connecting plate; 17. Servo motor; 18. Second lead screw; 19. Air duct; 20. First air outlet; 21. First flexible plate; 22. Inflation assembly; 23. Pressure plate; 24. Telescopic spring; 25. Airbag; 26. Mounting groove; 27. Second air outlet; 28. Second flexible plate. Detailed Implementation

[0021] like Figure 1-2 As shown, the present invention provides a sliding device for steel box girder construction, including a support assembly, a drive mechanism 4, and a receiving platform 3; the support assembly is installed on one side of the bridge to be erected and is parallel to the bridge to be erected; the support assembly includes two support plates 2 and support columns 1 set on both sides of the bottom of the support plates 2, the support plates 2 and the support columns 1 are arranged vertically between them, the two support plates 2 are arranged parallel to the bridge to be erected, and the surfaces of the two support plates 2 are connected to the drive mechanism 4, the drive mechanism 4 is set in the support assembly and has the function of synchronously adjusting the movement in the horizontal and vertical coordinate directions; the receiving platform 3 is used for placing and fixing the precast steel cage, and the receiving platform 3 is slidably installed on the end of the drive mechanism 4 that extends out of the support assembly.

[0022] Compared to the conventional method of directly lifting steel cages with a crane, this device can transport steel cages lifted by a crane within a safe construction area to a designated location on the bridge to be installed. The transport surface of the steel cage in this device is always within the installation area, and it has the same displacement function as the crane boom. Moreover, the transport height is closer to the surface of the bridge deck to be built, unlike the crane boom which is located at a high position far from the bridge deck. This method is safer, and the device can accurately move the steel cage to the designated position to complete the connection with the bridge.

[0023] During construction, the pre-tied and welded steel cage is placed on the receiving platform 3 using a crane. The lifting position is located away from high-voltage power lines. After the steel cage is placed, the receiving platform 3 is simultaneously slid along a direction perpendicular to the direction of the support components and along a direction parallel to the direction of the support components under the drive of the drive mechanism 4. This ensures that the steel cage on the receiving platform 3 always slides within a safe construction horizontal area close to the surface of the bridge to be installed, until the end of the steel cage is directly above the bridge column. After installation, the piston rod of the hydraulic cylinder, which is pre-placed on the bridge column, is extended to support the entire steel cage. The support components on both sides are removed, causing the piston rod of the hydraulic cylinder to retract, thus connecting the steel cage between the two bridge columns. Finally, concrete is poured manually.

[0024] The main function of the support platform 3 is to transfer the steel cage. The position of the steel cage is mainly determined by the position of the support platform 3. Therefore, in order to accurately transport the steel cage to the designated position, it is necessary to adjust the position of the support platform 3.

[0025] Specifically, the drive mechanism 4 includes a first power component 7, a second power component 8, and a mounting plate 5 that slides across the two support plates 2. The first power component 7 is disposed between the two support plates 2 and is connected to the mounting plate 5. Under the drive of the first power component 7, the mounting plate 5 moves along the two support plates 2 to adjust the position of the receiving platform 3. The second power component 8 is installed in the inner cavity of the mounting plate 5. During the process of the first power component 7 driving the mounting plate 5 to move, the second power component 8 synchronously drives the receiving platform 3 to move along the length direction of the mounting plate 5.

[0026] Among them, the first power component 7 and the second power component 8 respectively realize the lateral displacement and the longitudinal displacement to achieve the positioning of the bearing platform 3 coordinates. This positioning method is more accurate, and the moving route of the bearing platform always remains parallel to the construction surface of the bridge, that is, the bearing platform moves within the safe construction area.

[0027] During the movement of the receiving platform 3, the first power component 7 and the second power component 8 are connected by a linkage component. Through this meshing connection, the first power component 7 and the second power component 8 can be moved synchronously by a single power drive source, that is, synchronous adjustment in the horizontal and vertical directions can be achieved. This facilitates the rapid positioning of the receiving platform 3, improves construction efficiency, and simplifies the equipment.

[0028] Specifically, the first power assembly 7 includes a connecting plate 16 fixedly connected between two support columns 1, a servo motor 17 fixed on the connecting plate 16, a second lead screw 18 rotatably connected on the connecting plate 16, and a rack 11 disposed on the upper surface of the support plate 2 along its length. The second lead screw 18 is coaxially fixedly connected to the rotating shaft of the servo motor 17, and the second lead screw 18 is arranged parallel to the support plate 2. The bottom connecting block of the mounting plate 5 is screwed onto the second lead screw 18. Under the drive of the servo motor 17, the mounting plate 5 slides along the second lead screw 18. The rack 11 is engaged with the second power assembly 8 extending outward from the mounting plate 5. During the movement of the mounting plate 5 along the rack 11, the second power assembly 8 rotates synchronously with the movement of the mounting plate 5, so that the receiving platform 3 moves along the length of the mounting plate 5.

[0029] Furthermore, the second power assembly 8 includes a first lead screw 9 rotatably connected to the inner cavity of the mounting plate 5 along its length, and a gear 10 coaxially fixed to the first lead screw 9. A groove 13 is provided on the upper surface of the mounting plate 5. The first lead screw 9 is rotatably connected to the inner cavity of the groove 13. The first lead screw 9 is threadedly connected to the receiving platform 3. The gear 10 is coaxially fixed to the outer wall of the end of the first lead screw 9 that extends out of the mounting plate 5. The gear 10 is meshed with a rack 11. The gear 10 rotates along the rack 11 to drive the first lead screw 9 to rotate synchronously, thereby causing the receiving platform 3 to move along the mounting plate 5.

[0030] When the receiving platform 3 moves, the servo motor 17 is activated, which drives the second lead screw 18 to rotate. Under the drive of the second lead screw 18, the mounting plate 5 slides along the length of the two support plates 2. During the sliding process of the mounting plate 5, the gear 10 on the outer side of the mounting plate 5 rotates under the meshing action of the rack 11. The rotating gear 10 drives the first lead screw 9 to rotate, and the rotating first lead screw 9 drives the receiving platform 3 to move, so as to realize the adjustment of the position of the receiving platform 3. During the adjustment process, only a single servo motor 17 is needed for drive. The specific movement process of the receiving platform 3 is as follows: When the servo motor 17 rotates forward, the mounting plate 5 moves forward along the length of the two support plates 2. That is, the receiving platform 3 moves forward synchronously with the mounting plate 5 along the length of the two support plates 2. During the forward movement of the receiving platform 3, the first lead screw 9 synchronously drives the receiving platform 3 to move along the mounting plate 5 towards the support plates 2. Conversely, when the servo motor 17 rotates backward, the mounting plate 5 moves backward along the length of the two support plates 2. That is, the receiving platform 3 moves backward synchronously with the mounting plate 5 along the length of the two support plates 2. During the forward movement of the receiving platform 3, the first lead screw 9 synchronously drives the receiving platform 3 to move along the mounting plate 5 away from the support plates 2.

[0031] Among them, the receiving platform 3 has a tendency to move in both the horizontal and vertical directions. In order to reduce the offset of the receiving platform 3 and ensure that the receiving platform 3 moves in a straight line in both the horizontal and vertical directions, the movement path of the receiving platform 3 is restricted.

[0032] Specifically, such as Figure 1-2 As shown, guide rails 6 are provided on the upper surfaces of the two support plates 2 along their own length direction, and the guide rails 6 are located inside the rack 11. The bottom of the mounting plate 5 is provided with a sliding groove that cooperates with the guide rails 6. The arrangement direction of the sliding groove is parallel to the arrangement direction of the second lead screw 18. Through the cooperation of the guide rails 6 and the sliding groove, the transverse direction of the receiving platform is restricted, thereby ensuring that the receiving platform 3 moves linearly in the transverse direction.

[0033] Furthermore, a limiting member 12 is provided between the receiving platform 3 and the mounting plate 5 for the receiving platform 3 to slide along the length direction of the mounting plate 5. The limiting member 12 includes a limiting strip 14 fixed on the upper surface of the mounting plate 5 along the length direction and a limiting block 15 fixed on the bottom surface of the receiving platform 3. The limiting strip 14 is located on both sides of the groove 13, and the limiting block 15 slides on the limiting strip 14 to restrict movement in the longitudinal direction, thereby ensuring that the receiving platform 3 moves linearly in the longitudinal direction.

[0034] During the movement of the receiving platform 3, the steel cage located on the receiving platform 3 will inevitably sway. Since it is a high-altitude operation, it is impossible to straighten and fix it by manpower. During the movement, the steel cage may fall. Once it falls, it will not only injure people, but also damage the steel cage. At the same time, the offset steel cage cannot accurately reach the top of the designated position, causing inconvenience in installation. In order to avoid the swaying of the steel cage,

[0035] Specifically, such as Figure 4-5 As shown, an installation groove 26 is provided at the center of the upper surface of the receiving platform 3. Several air guide pipes 19 are provided on the receiving platform 3 along the length of the two side walls of the installation groove 26. A first air outlet 20 is provided on the opposite side wall of the air guide pipes 19 on both sides of the installation groove 26. A first flexible plate 21 is fixed on the inner wall of the first air outlet 20. An inflation component 22 for inflating the air guide pipes 19 is installed in the inner cavity of the installation groove 26. Under the action of inflation of the inflation component 22, the first flexible plate 21 protrudes outward to clamp and fix the side wall of the steel cage.

[0036] Furthermore, the inflatable assembly 22 includes a pressure plate 23 and an airbag 25 connected to the bottom of the pressure plate 23. The pressure plate 23 is slidably connected in the mounting groove 26, and the airbag 25 is located between the pressure plate 23 and the receiving platform 3. The airbag 25 is connected to the inner cavity of the air guide tube 19 through an air tube.

[0037] Among them, the air guide pipe 19 is rigid and the first flexible plate 21 is made of rubber. When the steel cage is placed on the receiving platform 3, the pressure plate 23 is driven to slide vertically downward under the action of the weight of the steel cage, and squeezes the air bag 25. The gas in the air bag 25 enters the first air outlet 20 through the air guide pipe 19, causing the first flexible plate 21 in the first air outlet 20 to deform. The deformed and outwardly protruding first flexible plate 21 causes the steel cage to be clamped between the air guide pipes 19 on both sides, so as to limit the side wall of the steel cage. During the clamping process, it is driven only by the weight of the steel cage.

[0038] Since the reinforcing cage is placed directly on the receiving platform 3, there is still a possibility of slippage between the reinforcing cage and the receiving platform 3 after the side wall of the reinforcing cage is restricted. Once slippage occurs, the reinforcing cage will generate inertia. Under the action of inertia, simply restricting the side wall is not enough to restrict the position of the reinforcing cage. In order to make the placement of the reinforcing cage on the receiving platform 3 more stable, it is necessary to restrict the bottom of the reinforcing cage while restricting the side wall.

[0039] Specifically, the inner cavity of the pressure plate 23 is hollow, and several second air vents 27 are evenly spaced on the upper surface of the pressure plate 23. A second flexible plate 28 is fixed inside the inner cavity of the second air vent 27. The airbag 25 is connected to the inner cavity of the pressure plate 23 through an air pipe. Under the pressure of the steel cage, the airbag 25 is compressed to deform the second flexible plate 28, thereby reducing the possibility of the steel cage sliding on the support platform 3.

[0040] The prefabricated steel cage is placed on the pressure plate 23, which slides vertically downward and compresses the air bladder 25. The air bladder 25 inflates the second air outlet 27, causing the second flexible plate 28 inside the second air outlet 27 to deform and protrude from the upper surface of the pressure plate 23. This causes the individual steel bars of the steel cage to be clamped between two adjacent protrusions, making it difficult for the steel cage to slide on the upper surface of the pressure plate 23. In conjunction with the first flexible plate 21 on the air duct 19, the steel cage is clamped in three directions, further improving the stability of the steel cage placed on the receiving platform 3. During the clamping process, the steel cage is driven solely by its own weight.

[0041] During the process of fixing the position of the steel cage, the limiting of the side wall and the bottom is achieved by the inflation of the airbag 25. The inflation of the airbag 25 is mainly achieved by the weight of the steel cage. That is, the limiting of the steel cage is mainly achieved by its own weight. If the instantaneous pressure is too large when the steel cage is placed, it will damage the airbag. In order to avoid this phenomenon,

[0042] Specifically, such as Figure 5 As shown, a telescopic spring 24 is connected between the side of the pressure plate 23 facing the mounting groove 26 and the bottom of the mounting groove 26 on both sides of the airbag 25. Due to the setting of the telescopic spring 24, the instantaneous pressure of the steel cage on the airbag 25 can be buffered, reducing the damage to the airbag 25. The setting of the telescopic spring 24 also improves the firmness of the connection between the pressure plate 23 and the support platform 3, reducing the possibility of separation between the pressure plate 23 and the support platform 3, and also facilitates the reset of the airbag 25.

[0043] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A sliding device for steel box girder construction, characterized in that, include, Support components are installed on one side of the bridge to be erected, and are parallel to the bridge to be erected; The drive mechanism (4) is provided in the support assembly and has the function of synchronously adjusting the movement in the horizontal and vertical coordinate directions; The receiving platform (3) is used for placing and fixing the precast steel cage. The receiving platform (3) is slidably installed on one end of the drive mechanism (4) that extends out of the support assembly. Under the driving action of the driving mechanism (4), the receiving platform (3) is driven to slide simultaneously along the direction perpendicular to the direction of the support component and along the direction parallel to the direction of the support component, so that the steel cage on the receiving platform (3) always slides along the horizontal area of ​​safe construction close to the surface of the bridge to be installed until it slides to the designated installation position. The support assembly includes two support plates (2) and support columns (1) set on both sides of the bottom of the support plates (2). The support plates (2) and the support columns (1) are arranged vertically. The two support plates (2) are arranged parallel to the bridge to be erected. The surfaces of the two support plates (2) are connected to the drive mechanism (4). The drive mechanism (4) includes a first power component (7), a second power component (8), and a mounting plate (5) that slides across the two support plates (2). The first power component (7) and the second power component (8) are connected by a linkage component. The first power component (7) is disposed between the two support plates (2) and is connected to the mounting plate (5). Under the drive of the first power component (7), the mounting plate (5) moves along the two support plates (2) to adjust the position of the receiving platform (3). The second power assembly (8) is installed in the inner cavity of the mounting plate (5). During the process of the first power assembly (7) driving the mounting plate (5) to move, the second power assembly (8) synchronously drives the receiving platform (3) to move along the length direction of the mounting plate (5). The first power assembly (7) includes a connecting plate (16) fixedly connected between two support columns (1), a servo motor (17) fixed on the connecting plate (16), a second lead screw (18) rotatably connected on the connecting plate (16), and a rack (11) set on the upper surface of the support plate (2) along the length direction. The second lead screw (18) is coaxially fixedly connected to the shaft of the servo motor (17), and the second lead screw (18) is parallel to the support plate (2). The bottom connecting block of the mounting plate (5) is screwed onto the second lead screw (18). Under the drive of the servo motor (17), the mounting plate (5) slides along the second lead screw (18). The rack (11) and the second power assembly (8) extend out of the outer side of the mounting plate (5) and engage with each other. During the movement of the mounting plate (5) along the rack (11), the second power assembly (8) rotates synchronously with the movement of the mounting plate (5) so that the receiving platform (3) moves along the length direction of the mounting plate (5). An installation groove (26) is provided at the center of the upper surface of the receiving platform (3). Several air guide pipes (19) are provided on the receiving platform (3) along the length of the two side walls of the installation groove (26). A first air outlet (20) is provided on the opposite side wall of the air guide pipes (19) on both sides of the installation groove (26). A first flexible plate (21) is fixed on the inner wall of the first air outlet (20). The inner cavity of the mounting groove (26) is equipped with an inflation assembly (22) for inflating the air pipe (19). Under the inflation action of the inflation assembly (22), the first flexible plate (21) protrudes outward to clamp and fix the side wall of the steel cage. The inflatable assembly (22) includes a pressure plate (23) and an airbag (25) connected to the bottom of the pressure plate (23). The pressure plate (23) is slidably connected in the mounting groove (26). The airbag (25) is located between the pressure plate (23) and the receiving platform (3). The airbag (25) is connected to the inner cavity of the air guide tube (19) through an air tube. A telescopic spring (24) is connected between the side of the pressure plate (23) on both sides of the airbag (25) facing the mounting groove (26) and the bottom of the mounting groove (26).

2. The sliding device for steel box girder construction according to claim 1, characterized in that: The second power assembly (8) includes a first lead screw (9) rotatably connected to the inner cavity of the mounting plate (5) along its length, and a gear (10) coaxially fixed to the first lead screw (9). A groove (13) is provided on the upper surface of the mounting plate (5). The first lead screw (9) is rotatably connected to the inner cavity of the groove (13). The first lead screw (9) is threadedly connected to the receiving platform (3). The gear (10) is coaxially fixed to the outer wall of the end of the first lead screw (9) that extends out of the mounting plate (5). The gear (10) meshes with a rack (11). The gear (10) rotates along the rack (11) to drive the first lead screw (9) to rotate synchronously, thereby causing the receiving platform (3) to move along the mounting plate (5).

3. The sliding device for steel box girder construction according to claim 1, characterized in that: The upper surfaces of the two support plates (2) are provided with guide rails (6) along their own length direction, and the guide rails (6) are located inside the rack (11). The bottom of the mounting plate (5) is provided with a sliding groove that cooperates with the guide rails (6), and the arrangement direction of the sliding groove is parallel to the arrangement direction of the second lead screw (18).

4. The sliding device for steel box girder construction according to claim 2, characterized in that: A limiting member (12) is provided between the receiving platform (3) and the mounting plate (5) for the receiving platform (3) to slide along the length direction of the mounting plate (5). The limiting member (12) includes a limiting strip (14) fixed on the upper surface of the mounting plate (5) along the length direction and a limiting block (15) fixed on the bottom surface of the receiving platform (3). The limiting strip (14) is located on both sides of the groove (13), and the limiting block (15) slides on the limiting strip (14).

5. The sliding device for steel box girder construction according to claim 1, characterized in that: The inner cavity of the pressure plate (23) is hollow. Several second air vents (27) are evenly spaced on the upper surface of the pressure plate (23). A second flexible plate (28) is fixed inside the inner cavity of the second air vent (27). The airbag (25) is connected to the inner cavity of the pressure plate (23) through an air pipe. Under the pressure of the steel cage, the airbag (25) is compressed to deform the second flexible plate (28), thereby reducing the possibility of the steel cage sliding on the support platform (3).

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